13404342221 has 4 divisors (see below), whose sum is σ = 13405393344. Its totient is φ = 13403291100.

The previous prime is 13404342209. The next prime is 13404342229. The reversal of 13404342221 is 12224340431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12224340431 = 22573 ⋅541547.

It is a cyclic number.

It is not a de Polignac number, because 13404342221 - 2¹⁸ = 13404080077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13404342229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506195 + ... + 532016.

It is an arithmetic number, because the mean of its divisors is an integer number (3351348336).

Almost surely, 2^13404342221 is an apocalyptic number.

It is an amenable number.

13404342221 is a deficient number, since it is larger than the sum of its proper divisors (1051123).

13404342221 is a wasteful number, since it uses less digits than its factorization.

13404342221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051122.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 13404342221 its reverse (12224340431), we get a palindrome (25628682652).

The spelling of 13404342221 in words is "thirteen billion, four hundred four million, three hundred forty-two thousand, two hundred twenty-one".